20111210311 has 4 divisors (see below), whose sum is σ = 20149664392. Its totient is φ = 20072756232.

The previous prime is 20111210257. The next prime is 20111210321. The reversal of 20111210311 is 11301211102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11301211102 = 2 ⋅5650605551.

It is a cyclic number.

It is not a de Polignac number, because 20111210311 - 2⁹ = 20111209799 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111210291 and 20111210300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111210321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19226256 + ... + 19227301.

It is an arithmetic number, because the mean of its divisors is an integer number (5037416098).

Almost surely, 2^20111210311 is an apocalyptic number.

20111210311 is a deficient number, since it is larger than the sum of its proper divisors (38454081).

20111210311 is an equidigital number, since it uses as much as digits as its factorization.

20111210311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38454080.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 20111210311 its reverse (11301211102), we get a palindrome (31412421413).

The spelling of 20111210311 in words is "twenty billion, one hundred eleven million, two hundred ten thousand, three hundred eleven".